Full Idea
The highest good is harmony of spirit.
Gist of Idea
The supreme good is harmony of spirit
Source
Seneca the Younger (On the Happy Life [c.60], §08)
Book Reference
Seneca: 'Dialogues and Essays', ed/tr. Davie,John [Penguin 2007], p.92
A Reaction
This idea is straight from Plato's Republic.
Related Idea
Idea 137 As with other things, a good state is organised and orderly [Plato]